safe seat; safe electoral district
Political term for an electoral district where a particular party or candidate is almost certain to win. Derived from 無風 (no wind) + 区 (district), implying a lack of political competition.
See also: 無風
He has been repeatedly elected in a safe seat.
That electoral district has long been a safe seat for the ruling party.
激戦区 is the opposite: a fiercely contested electoral district.
Compound of 無風 (むふう, 'no wind; calm') and 区 (く, 'district'). The political sense is a metaphorical extension: a district with no 'wind' of competition.